mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 20:36:16 +01:00
114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
|
|
|
|
/*
|
|
Code for handling doubly linked lists in C
|
|
*/
|
|
|
|
#include "mysys_priv.h"
|
|
#include <my_list.h>
|
|
|
|
|
|
|
|
/* Add an element to start of list */
|
|
|
|
LIST *list_add(LIST *root, LIST *element)
|
|
{
|
|
DBUG_ENTER("list_add");
|
|
DBUG_PRINT("enter",("root: %p element: %p", root, element));
|
|
if (root)
|
|
{
|
|
if (root->prev) /* If add in mid of list */
|
|
root->prev->next= element;
|
|
element->prev=root->prev;
|
|
root->prev=element;
|
|
}
|
|
else
|
|
element->prev=0;
|
|
element->next=root;
|
|
DBUG_RETURN(element); /* New root */
|
|
}
|
|
|
|
|
|
LIST *list_delete(LIST *root, LIST *element)
|
|
{
|
|
if (element->prev)
|
|
element->prev->next=element->next;
|
|
else
|
|
root=element->next;
|
|
if (element->next)
|
|
element->next->prev=element->prev;
|
|
return root;
|
|
}
|
|
|
|
|
|
void list_free(LIST *root, uint free_data)
|
|
{
|
|
LIST *next;
|
|
while (root)
|
|
{
|
|
next=root->next;
|
|
if (free_data)
|
|
my_free(root->data);
|
|
my_free(root);
|
|
root=next;
|
|
}
|
|
}
|
|
|
|
|
|
LIST *list_cons(void *data, LIST *list)
|
|
{
|
|
LIST *new_charset=(LIST*) my_malloc(key_memory_LIST, sizeof(LIST),MYF(MY_FAE));
|
|
if (!new_charset)
|
|
return 0;
|
|
new_charset->data=data;
|
|
return list_add(list,new_charset);
|
|
}
|
|
|
|
|
|
LIST *list_reverse(LIST *root)
|
|
{
|
|
LIST *last;
|
|
|
|
last=root;
|
|
while (root)
|
|
{
|
|
last=root;
|
|
root=root->next;
|
|
last->next=last->prev;
|
|
last->prev=root;
|
|
}
|
|
return last;
|
|
}
|
|
|
|
uint list_length(LIST *list)
|
|
{
|
|
uint count;
|
|
for (count=0 ; list ; list=list->next, count++) ;
|
|
return count;
|
|
}
|
|
|
|
|
|
int list_walk(LIST *list, list_walk_action action, uchar* argument)
|
|
{
|
|
int error=0;
|
|
while (list)
|
|
{
|
|
if ((error = (*action)(list->data,argument)))
|
|
return error;
|
|
list=list_rest(list);
|
|
}
|
|
return 0;
|
|
}
|